Discussion
1397 x 1397 = ?
Answer: A
\(1397\times 1397 = (1397)^{2}\)
\(= (1400-3)^{2}\)
\(= (1400)^{2}+(3)^{2}-(2\times 1400\times 3)\)
\(= 1960009 - 8400\)
\(= 1951609\)
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